Current questions and answers regarding the map editor.

Gentlemen! A problem has arisen: during the map creation process (and it's especially frustrating because it happened near the end), the dungeon disappeared. That is, if you click the "show dungeon" button, you only see the objects. There are no walls or floors. Instead, there's only the sky texture. If you launch the map in the game, the dungeon is normal, but in the editor, it still lacks walls and floors. Also, if you try to paint the missing ground with any type of soil, the editor crashes. Why could this have happened, and is there anything that can be done about it?